Kim purchased a cell phone but is unsure about which rate plan to select. The "regular" plan charges a fixed fee of $55 per month for 1000 minutes of airtime plus $0.33 per minute for any time over 1000 minutes. The "executive" plan charges a fixed fee of $100 per month for 1200 minutes of airtime plus $0.25 per minute over 1200 minutes.

At what level of use would Kim be indifferent between the two plans?